Stoker



M. ALPERN.

STOKER.

APPLICATION FILED FEB. 25. 1914.

Patented Jan. 20, 1920 3 SHEETS-SHEET I.

Patented Jan. 20, 1920.

3 S HEET$SHEET 2.

M. ALPERN.

STOKER.

APPLICATION FILED FEB. 25, 1914.

M. ALPERN.

STOKER.

APPLICATION FILED FEB. 25, 1914.

1,328,631. 1 Patented Jan. 20, 1920.

3 SHEETSSHEET 3.

NITED STATES PATENT OFFICE.

MAXWELL ALPERN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR 'IO AMERICANENGINEERING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

STOKER;

Patented Jan. 20, 1920..

Application filed February 25, 1914. Serial No. 820,903.

To all whom it may concern:

Be it known that I, MAXWELL ALPERN, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Stoke rs, of which the following is a specification.

One object of my invention is to provide a novel form of stoker whoseconstruction shall be such that its grate sections when properlyactuated shall force the ashes toward the bridge wall of the furnace andthereby crush the larger sized clinkers', it being further desired toprovide a stoker having the above characteristics which shall berelatively simple and substantial as to its design and arrangement ofparts and which moreover shall include novel means for dumping theashes.

I also desire to provide a novel form of stoker grate and supporttherefor particularly designed for reciprocation toward and from thebridge wall, the invention also contemplating novel and relativelysimple means for causing such operation.

These objects and other advantageous ends I secure as hereinafter setforth, reference being had to the accompanying drawings, in which:

Figure 1 is a vertical section of the furnace of a stoker illustratingmy invention as applied thereto;

Fig. 2 is a plan of the apparatus shown in Fig. 1, and

Fig. 3 is a side elevation partly in vertical,

section and on a smaller scale than Figs. 1 and 2, showing my inventionwith the parts associated therewith.

In the above drawings, 1 represents a portion of the main framestructure of an underfeed stoker, which for example may be of the Wellknown Taylor type extending transversely of the furnace in which it isinstalled and having mounted between it and a bridge wall 2 an overfeedgrate consisting of a series of transversely extending grate bars orsections 3 terminating in a bottom bar 4:. Below and to the rear of thislatter is a series of elongated dumping plates 5, all pivoted on atransversely extending shaft 6 from which they extend into the immediatevicinity of the bridge wall 2. All of these plates are connectedadjacent their outer or rear ends by a transversely extending bar 7having at intervals downwardly extending arms 8 to each of which isconnected a link 9 attached to any suitable operating mechanism wherebysaid dumping plates may be caused to turn on their supporting pivotshaft 6, from the position shown in full lines in Fig. l to a positionin which'they are I substantially vertical, for the purpose of dumpingashes which may have accumulated upon them.

Projecting forwardly from the main structure 1 which forms part of thewind box of the stoker, is a relati 'ely heavy bottom plate or casting10 lying in a substantially horizontal plane and supported in anysuitable manner at the sides of the stoker, as well as from saidstructure 1. Slidably mounted on the rear of this plate is a relativelynarrow transversely extending plate 11 rigidly fixed to the bottom gratebar or section 41 and having at its rear edge a trans versely extendingrolled section suchas the angle iron 12. At substantially its middlepoint this angle iron has fixed to it a forwardly projecting lug 13connected by a pair of links 1 1 to an arm 15, fixed to a spindle l6'rotatably mounted in a bearing 17 carried by the bottom plate 10. Saidspindle extends below said plate and on its lower end has fixed a bellcrank lever 18, one of whose arms is connected through a link 19 to anydesired mechanism whereby it is caused to oscillate, while a second armis connected through a link 19 to a similar bell crank lever (not shown)belonging to another stoker. I

In addition to the lug 13, the angle iron 12 has fixed to it a series ofbrackets or lugs 20, to each of which isconnected a grate reciprocatingbar 21. As shown in Fig. 1, each of'the grate sections or bars 3 has atits rear end a downwardly projecting lug 22 which is bolted or otherwiseconnected to this bar 21, the topmost grate bar having also one or moreelongated projections 23 each rounded at its lower end so as to beslidable on a supporting bracket 24: which thus constitutes a slideway.

Each of the grate bars is shown as being in the form of a transverselyextending plate downwardly flanged along the rear edges and upwardlyflanged at the front edges and when assembled as shown in Fig. 1, theflanged rear edge of each bar rests upon the front upper face of the barnext below it, having openings through which air delivered from the windbox escapes into the fuel from the chamber formed by the grate bars, theplate and the front face of the frame-work 1. It is to be understood,however, that other forms of grates may be em- 5 ployed, withoutdeparting from my invention. The topmost grate bar 3 extends under thedownwardly inclined edge'26 of a top plate 27 which forms the bottom ofone of the retorts 28 of the stoker and under op- 0 erating conditionsas the bell crank lever 18 is oscillated with its spindle 16, the wholeseries of grate bars is likewise reciprocated relatively to the bridgewall 2, the turned over edges of the said bars constituting a'butmentswhich are alternately withdrawn from and projected under the mass offuel and ashes lying upon them. As a result, any large clinkers are moreor less broken as they are caught and crushed between the 20 bridge walland these substantially vertical edges of the grate bars, each series ofwhich is slidably and independently supported on brackets 24: (of whichthere may be any 7 suitable number) and the front end of the 25 bottomplate 10.

The grate bars of the sections 3 are supplied with air under pressuredelivered from the wind box through an opening controlled by a dampermounted to swing on a hori- 30 zontal pivot'and controlled in anysuitable manner from the front of the stoker. As is customary in stokersof the type to which my invention is applied, air under pressure flowsfrom the wind box through the twyers 29 from which it is delivered intothe fuel.

It is to be noted that while the grate bars or sections 3 areillustrated with their top faces somewhat inclined, they may besubstantially horizontal or in some cases made 40 in widely varyingforms without departing from my invention, which contemplates a.construction providing an overfeed grate which extends transverselybelow a retort or series of retorts in combination with a bridge walland mechanism whereby under operating conditions the grate isreciprocated bodily toward and from said bridge wall.

I claim:-

1. In an underfeed stoker, the combination of downwardly inclined seriesof twyers; a retort between said twyers and having a relativelyfixed'bottom; a. wind box; a downwardly inclined reciprocable gratemounted below said retort; plates associated with said grate to form acasing connected to receive air under pressure from the wind box; withmeans wholly outside and independent of the retort for reciprocatingsaid grate including a member connected to a source of power and meansextending into said casing connecting said member to the grate.

2. The combination in a stoker, of a supporting frame having a bottomplate provided along one edge with a bearing surface;

brackets each having a bearing surface and supported by the frame abovesaid bottom plate; a member elongated transversely of the stoker furnaceand slidably engaging the bearing surface on the bottom plate; a seriesof grate sections each bearing along one edge on the next lower section,the topmost section slidably engaging the bearing surfaces of thebrackets; bars respectively connecting all of the grate sections withthe slid-able member; with means for bodily reciprocating said grate.

3. The combination in a stoker, of a supporting frame; a grate bodilymovable thereon and composed of a series of sections elongatedtransversely of the stoker furnace, each of said sections having :1depending edge engaging the next lower section; bars connecting the rearportions of all of the sections; a slidably guided member extendingtransversely of the stoker and connected to all of said bars; and meansconnected to said member for reciprocating the grate on the supportingstructure.

4. The combination in an inclined underfeed stoker of series ofdownwardly inclined e bridge wall; with means for moving said gratetoward and from said bridge wall to 95. crush the clinkers between thelatter and itself, consisting of a fixed structure includ ing asubstantially vertical bearing; a vertically extending pivot spindlemounted in said bearing; a lever arm fixed to said spindie and connectedto a source of power. with a second arm on the spindle connnected to theouter portion of the grate.

5. The combination in a stoker, of a supporting structure having upperand lower bearing surfaces; a grate formed of a series of sectionselongated transversely of the stoker furnace, the -'top and bottom gratesections slidably co-acting with the bearing surfaces of the supportingstructure; a series of forwardly inclined bars for connecting all, ofthe grate sections together;

a transversely extending member connected to all of said bars; andmechanism connected to said member for reciprocating the grate on thesupporting structure.

6. The combination in a stoker, of a supporting frame having a bottomplate provided along one edge with a bearing surface; brackets eachhaving a bearing surface and supported by the frame above said bottomplate; a member elongated transversely of the stoker furnace andslidably engaglng the bearing surface on the bottom plate; a series ofgrate sections each bearing along one edge on the next lower sec tion,the topmost section slidably engaging the bearing surfaces of thebrackets; bars respectively connecting all of the grate sections withthe slidable member; with means connected through said slidable memberfor bodily reciprocating said grate.

7. In an underfeed stoker the combination of downwardly inclined seriesof twyers; a retort between said twyers; an inclined grate extendingtransversely at the lower end of the latter; a bridge wall; and meansoutside and independent of said retort for moving the grate bodilytoward and from said bridge wall to crush the clinkers between thelatter and itself.

8. In an underfeed stoker the combination of downwardly inclined seriesof twyers; a retort between said twyers; a grate composed of a series ofparallel sections mounted one above the other in stepped relation andextending transversely of the stoker furnace below the bottom of saidretort; a bridge wall; and means outside and independent of the retortfor bodily moving said grate toward and from the bridge wall.

9. In an underfeed stoker the combination of downwardly inclined seriesof twyers; a retort between said twyers including a relatively fixedbottom structure at its rear lower part; a grate composed of a series ofindependently removable parallel sections extending transversely of thestoker furnace in stepped relation below the retort and each having anelongated substantially vertical face; a bridge wall; and means belowthe bottom of the retort for moving the grate bodily toward andfrom thebridge wall.

10. In an underfeed stoker the combination of downwardly inclined seriesof twyers; a retort between said twyers; supporting means below theretort including a slideway and a supporting plate below and to the rearthereof; an inclined grate extending transversely at the lower end ofsaid retort and having its forward upper end carried by the slideway andits lower rear end on said plate; a bridge wall; and mechanism forcausing the grate to move on said slideway and plate toward and fromsaid bridge wall.

11. In a furnace stoker, retorts having relatively stationary bottomplates; overfeed grates sections located below said stationary bottomplates; ash receiving dumping grates plates over said dumping grates andtoward and from the furnace bridge wall.

12. In a furnace, retorts having relatively stationary bottom plates;overfeed grate sections located below and to the rear of said bottomplates; ash receiving dumping plates located below and to the rear ofsaid overfeed sections; a wind box for supplying said overfeed sectionswith air under pressure; and means structurallv independent of theretort structure for causing said overfeed sections to move bodilytoward and from the furnace bridge wall. I

13. In a furnace, retorts having relatively fixed bottom plates; ashreceiving dumping plates extending transversely at the rear of thefurnace; a series of air discharging over-feed grate sections mounted toreciprocate beneath said fixed bottom plates and over the dumpingplates; and means for reciprocating said overfeed sections.

1+. In a furnace an under-feed stoker section comprising retorts havingbottom plates and side walls; ash receiving dumping plates located atthe rear of the furnace; inclined over-feed grate sections mounted formovement below and independently of said bottom plates and over said ashreceiving dumping plates; means for bodily moving said overfeed sectionstoward and from the furnace bridge wall; and means forsupplying saidoverfeed sections with air under pressure.

15. In a furnace, retorts having relatively stationary bottom plates andside Walls; pivotally mounted ash receiving grates below and to the rearof said retorts; a series of inclined air supplying overfeed gratesections extending transversely of the furnace between said retorts andsaid ash receiving grates and adapted to reciprocate below andindependently of said retort bottom plates and above said ash receivinggrates; means for supplying said overfeed grates with air underpressure; and means for reciprocating said overfeed sections toward andfrom the furnace bridge wall.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MAXWELL ALPERN.

\Vitnesses M. EMMA BURGESS, CHARLES L. SMITH.

